State Exam — General Science
BPSC · UPPSC · MPPSC · RPSC · TNPSC — State PSC Exam Practice
Showing 71–74 of 74 questions
Q.71
Easy
Physics
A car accelerates from rest at 2 m/s². How long does it take to reach 20 m/s?
Correct Answer: B. 10 seconds
Explanation:
Using v = u + at, where u = 0, v = 20 m/s, a = 2 m/s². 20 = 0 + 2t, so t = 10 seconds.
Q.72
Easy
Physics
Which of the following statements about gravitational force is correct?
Correct Answer: C. Gravitational force is always attractive
Explanation:
Gravitational force is always attractive, acts between any two masses, is independent of the medium, and is governed by Newton's law of universal gravitation.
Q.73
Easy
Physics
Which of the following has the highest refractive index?
Correct Answer: C. Diamond
Explanation:
Refractive indices: Air ≈ 1, Water ≈ 1.33, Glass ≈ 1.5, Diamond ≈ 2.42. Diamond has the highest refractive index among these options.
Q.74
Easy
Physics
A current of 5 A flows through a resistor for 10 seconds. How much charge passes through it?
Correct Answer: C. 50 C
Explanation:
Charge Q = I × t, where I = 5 A and t = 10 s. Q = 5 × 10 = 50 Coulombs.